Year	current US$
2000	36.97342419
2001	74.98530552
2002	125.0397309
2003	160.73910443
2004	186.23793927
2005	201.31896703
2006	232.17671291
2007	333.9128746
2008	415.75004858
2009	354.6495882
2010	332.67635906
2011	378.27509697
2012	347.79420523
2013	375.64127392
2014	354.70669898
2015	283.37759616
2016	280.07852757
2017	296.50176722
2018	366.35212617
2019	374.04771452
2020	408.44365486
2021	574.70704436